Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 21,738	$ 66,076
Total accumulated amortization—intangible assets	(14,934)	(15,293)
Total	6,804	50,783
Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	13,418	35,756
Total accumulated amortization—intangible assets	(7,652)	(9,031)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	3,330	25,330
Total accumulated amortization—intangible assets	(2,837)	(4,524)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	4,990	4,990
Total accumulated amortization—intangible assets	$ (4,445)	$ (1,738)